Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a294567184a0a0ca06ce1785831cf8329c8a6b15355fa3fc4fbba1e7bdbaa0da' 
  AND token = 'PEjrfKXdqxdJTRE3u3VnZLbPM7oEediYMx1H6Sh/rN8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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