Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c4f3bd650c4e1e4fbb2ef4cd7f6d50d36988e6217580cc56a1e66c3b37cf67e' 
  AND token = 'Nxrn/XIYS6UkZndYzYufigS6ozRDpcYkFe1bsbvP9KQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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