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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '2f2ffb46279b45526042018b998f5ca9931bc32ad6076aec1fe98e1d6586c21b' 
  AND token = 'Bfn4w63bil360TLC41ZPcig83WSTo648MDTByw7MZGQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}