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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '08c645ea7393fa36cd90b044499794339c242d0a5fb8d4b6ebbaba172a62c99b' 
  AND token = 'SPkDseEuivjsuCIWmHTs/5cfpZj2CkyYsVvPBDv43/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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