Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7461f4b6939bdfec4af0c8f74c4376c09774348593644c7092c13f9b4eaead2' 
  AND token = 'S9GJdMls1c2ODU5ccSuu1kDNEoStA8RtG7EJDhkj1CI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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