Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f57a3b42991456ef4e54ebcf952412263c0b3586bbc9a4d054b326f44d3b4614' 
  AND token = '1ORS5+H89J8sffPwpKT1OdRz3i3s42NQC7poot0ctxI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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