Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8271198a56ca5d8746a3454a10de15b12b757f96fb00945b75c9f4644e816b9' 
  AND token = 'bmMLyGoA6gGN16+paRcTeG3Fq6ulfdFwKs+4UWFNXVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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