Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad0e968025ce803d0cc7dd3c0abd6628d9fcaea9f08342d152220bfdb62e4f4e' 
  AND token = 'sgui9XSkv8i9NBWTYJWjk+4x6c57dCGLcz/woAtit0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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