Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db699ab072db7902d65a5581589e19c25448260c2933a6a343c7743ee1def0a9' 
  AND token = '4XxDBnkWP3wZMlUC3Q0LbAcXhz4z7y3J/+rNkISqiWs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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