Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '401321222a3bd67b3b09b868793d78766050e57bb3d5cc7b3dd021b4d25575ec' 
  AND token = 'RqVlK8D3cBz3Dk7iQRWQhSDMfCG9aioc0TEQ8Im94nY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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