Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e394e4a617e6feccc5251ea73ed616a2764271dfd2f5d092c3cb8ef23c8a40a4' 
  AND token = '+p7BS1aSVKn0aI7VtWBqMpO/dYDoFNSpjGy5hcf7qNQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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