Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e81dbdf008916d3f1ef194b1d0eb8272d5e840aecd8e5be250c7726557715c6' 
  AND token = 'r4GVMJJXghjhlChQpS5ulNtnRePm7/HNscTGOno6w58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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