Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a174c03177c09d5b15275fa34741109648f019ca3251ed0249e080cf39d30e0c' 
  AND token = '/EWlWQxXnfNWwpEJBS2N4dwW4BM777UyZqRczOIH3nY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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