Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1c1e6a316960350f99f7ca356c600088fa8e300c4a36e22b20b6f9e327e5f4b' 
  AND token = '4cEhP0GATsCjHGF+4byhDDCZXbmbYNYYcpVHrVzI2r8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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