Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3807fe47032c3e8a656063d81539302c78db15547c48951aba546d4bad0c884' 
  AND token = 'DuOPOgLkqU9JbdPuDYSATvRuzoYK2lbZN5JpMSoUkqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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