Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '747f4ffe2f66186d9537678f8c52595d1e6a21e78c45327c332f633258f27c25' 
  AND token = 'EJZgiDtka2AaeHN5m68z60JEYyllyTZ1aqGjPLrW2k8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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