Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '848497036eb6371a00dac0062ff5511b4c519d6f88bde13be3bc33600c3b0c7c' 
  AND token = 'iIQGJU84PzYVUD64y6+VMvQGSDxNgGbYQq1+ad8HmdI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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