Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6978ac4053e0e1640fbc4b84b105aea5a67d36900507d6ed0977c53b5ef7e619' 
  AND token = 'aIaolKGsgaOde7gwMXWREzbDT9oHDtqe8OCvK493p48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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