Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'a76c081007a770cea582ce37b13188f1ad4cac2d849de5fa04d6278b1e1d7ea1' 
  AND token = 'mhoxUR4Xk5z9og+4FXhQh9Zg3YeN4t1i0E1833lH9X4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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