Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8dde91be982c6eef876f01800eadda4f0d01283b10618dac159300d9c2a5d9f' 
  AND token = 'zv+fxTkk/lUo9BRFxxO69F6LWBamgv3Xwtevz5RT8+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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