Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '974aaef80e56df39e367d82c317ef0db5452637554d372042a94ffdd9ef768ee' 
  AND token = '4iiYHoVReb7ILABy/A2ELaPVHKq5r3GMsP8aOxFpfGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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