Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '0730d79dd4f811ead71f491d4c0a41ad6cca3fabd52bc4e48bee6897f8c9aca2' 
  AND token = 'zQ7WJJUbjrKot30A8H8wwZKa/z8VAzINO03JYXqqe9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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