Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd58e857465c08b1b200e857fa66413c8c8321333c5d3dc56928602f76b815b5' 
  AND token = 'mBacFg8oLqe21V41DVHTwZJZ+M6p4lQWJCpe789HLdM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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