Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '2bba42fc03d2955363ced108a2e467e78cabe9788b1428e22dde6f84291719c6' 
  AND token = 'j5Xe8nlYIJLSvatxesOqPFz3NLse4FvJYEFcLkIwFc8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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