Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e6e193c75efdb48219ee81348e3bec0a87e62f41d0fa35ce7d19809c9336c4d' 
  AND token = 'LuQYP2Cf3e1tUpodk/8yH0L/VThI5H6k/d0DmwfiQnM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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