Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7683710b96d3c45da6585ad58dd09b95026bae8b8fa2f635d5c1e3d2c27242ed' 
  AND token = '2QGWq/49tUFNtZwFWFmaknR288aYtOFC61TXckL6Nnc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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