Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'a4a3a3901ae562085d6f91fa098bef14b830508483552ceb4917b8d8f14de5f0' 
  AND token = 'WoCzrOxdQ+8mSmXULT75Tm99k0XuWyTLyRuHF71KtfA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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