Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e0463e4aa5542242e66784f482fad35ef7275b852c02792ef7cbe957752950b' 
  AND token = '3jqqTzNdE/5sFkDv5jHsDCTe1LVomHLNw4blZW5YtPg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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