Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ba587ece84b1c6fe307be5efd14152d2606ce0f1fdcb5c2a84a2e3f6687e0a2' 
  AND token = 'QgS583a6pTde/2AHL7/IrGjm2xIbDEuN3WsWQJr2rxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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