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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'ffe788834c0a2d7c1e01397fc5c34b42c5ca2f4c47002406ed0ab4e5498be17d' 
  AND token = 'lKEfE4hO1Eo0MPD5oCkD7CnLs5wDxqgFKQrl8fD7Big=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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