Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dff96ecd117dfcb902a444546ef71b21743124a5be95bd464f056495473aad22' 
  AND token = 'JvkI2s/yt5MYzTGfCvROOltjFw5sXTEMa0eiX/IMIes=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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