Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6684a932595a66bb1b499f040992769b9f6f2b7d85d43a13060838c08aa3cdd' 
  AND token = '/rZrVICJ4Bs0eAZIryO7Ph/KfNUZQTFEbDNhwCmWZ5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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