Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21157291dad9600338a45f65e2e806b942b2869121af2381596de9fe6b365bc9' 
  AND token = 'DrGWTdByu1QdYAx8qoRC5C78yXn3iCU9j1+H7UdItUw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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