Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '1537be199fe4f28e3fa1071816dfb314b15d60b0ce849f5fd863e180db2b3b55' 
  AND token = 'lPcG0pKUh36nR+C2w5Qb5VPOKndQfyW8NfL/TSxkhhA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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