Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'e0d2aa4e32e510e5f5047fed014d69c9f204c0ef5bba01bd09ff7bd49cc84284' 
  AND token = 'VDCs8HecVyv1/Zqg5eIKcN08LqazHLxgXhMpdRCug0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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