SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '0b8b501a84cbd328c4cf5343f7f1e2548e0ade84f93f659362fc600988b76040' 
  AND token = 'tr8iTZUSBVPz6cggP/ovIKi+bsm9IVHiJTMkxWiOMAM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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