Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42e7cd4cdb97379838311799a66b813f83a7ac79e85adc19ed2dc723f2d7fe12' 
  AND token = 'UwZ2yKpI6KA8d0uCX8HYLn7k9HlVCbsXw3jVIfC9dcE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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