Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfecd6e17eaf72a599d8b1a346e7debd4d872a3bf7e644fbe25cc6386777a31a' 
  AND token = 'gPwPoZqgJ4zVBDXZfokB0ZpJLBieUWfXSfJRzfuFCRk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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