Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '7798ac58b6ec6892eb69c03753e0fe44b2a1c7e151c79ce4aef898996ec1614b' 
  AND token = 'rbWQlYds4H3jvEKQFRqIdMP09koVqWNp2evdJDGkaa4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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