Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc7c3ff27c3a4612affe0b1aa9a1997e2e437283c2331a53cc87573464e89931' 
  AND token = 'fmh887ZQTIqDmLSbuuMEu68QXctPFCALWDww+W0Z6o8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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