Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ed8412ed1c45b0be86ad0385b6014609241fa1e407a0b2f3ac6fa2f682ddff0' 
  AND token = '+obG0TFWX4s9v2O9kyIQQWXAJlLXRxs1gZQhJugq2Hk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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