Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'de2f224b73a7cf291dc00a1c710cb7892978dcd492f230476d3d1dabeaa84bee' 
  AND token = '9wWwg/rAS7QOsUh+LWcU12mHl010kJJ4YohCOvSHN0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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