Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d9addb1a8dae650bf0b66538e8cf0b82bc003e74d8d6ee74aa7e668db1dc901' 
  AND token = 'f7kne8884xIs7mIvyhZm+EqRIDeEDK4bPKYhcIMZjOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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