Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7eba683a273a1fc5dd095b24afba66f8f5b659605dfeb1fd8dbb2d40fe1909a6' 
  AND token = 'Tb6Ur88T7/CDRC6haNFC+a346c9Wm6YKB2KTthRb1hU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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