SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '4960673ea1c7824418b83fc05f2985e82d87293d1bad1c433410fe018d8c8fe2' 
  AND token = '2ik+TzEmjEj6GKU889Sis4vJ/PdUUqafwr5jkR8PHWY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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