Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9f7898a7216955c990ffbddf618540bcaf9cf03a187576d1330c6bcd29cdc75' 
  AND token = 'fwPPUfya4P2BHpkqcX7l1HywoYy/QtCs04ISrteMBxo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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