Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ae8ab8b275ebb314d48884e861c483ef27ea4d2e1d85015f4324ac8b63c9da0' 
  AND token = 'doiMD5j7Ki8elJJgwWZIw/zNLo0kW5F+eSgwGmVfIDg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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