Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91c3e7e5be573a2c37fc75923eeca9bf671920cbb1683254e9a1112e78e1b2c6' 
  AND token = 'fhSCH7tfZvni+CBE+U85xmFM5qr5FJzdMtkSqjUXiQg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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