Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbcc0d0e93a2397341135637131fb83b0b65982563f8a8e8ec6ed75e72340b01' 
  AND token = 'H3tBGrA0LeUHNjAfIlNb0mfw3pRTvjnlWOE7Ex9y8p4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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