Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88b293ff13abeb1f07aea5b6d4a0f5ddb18229a02763e581eb1f24b941ecf541' 
  AND token = '0DNptHgX1SquLy65VALDer7rUk+Y41LSM2u/UiCwK34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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