Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '559672119007fc9ff633584fe3f12b667d406851a609ba0d3da8a0894e296cb1' 
  AND token = 'zSWqZuuXH8V2ZLRyslPci2hUJcUMLCAMCni2nzb2acE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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