Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '691ed798b4e4846bef00861205598d7867aa8164b2739fd002c1408bff4026b7' 
  AND token = '+Oa3pWS3TwG5zeopjudUUtrsz5ZkKCphdGKEVk4h0zw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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