Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '029e42a94d55ebf805946c311a446e63c447a9096dc409d68fbf1eeb49e41ac2' 
  AND token = 'DWDBiaTaO8mTqMbuXZ3o5fgjLElrUPgoMTjOJ1MURbg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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