Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'b405a1d8c9beafa88b31eb69c47ff6b890725bdfdbf2a08da5805d2f8753f0b4' 
  AND token = 'CLS6xSAkGj5FqPIxJ1hnXDfpwpbG7OP9W5sj9tJR4FA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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