Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c79f7469aaa2691835d7165933306d044d42aeb0d54d01a05d1eeefe01aa0351' 
  AND token = 'JBfqxmybiKxUjYy9TavMWyZuMPAvmPDLUnJyNF4tNvw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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