Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '576474800d38498a0a1b3a80d46b9fb82ec35345a2463d4e01c85e0e09bd6f38' 
  AND token = 'LCEGwOdxf8hy4QbEs8dlgDomQISJAG1eP8IO4ccHFjQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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