Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9f6d1b12ebb55fd8ce2f3f4ae067d3bab36dc95dbfde0d31b1938d61d8c7975' 
  AND token = 'W21nk5CMaGd16NPHgFUORio1C9WE0rsDxGdBekzQ71A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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