Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b2642fdc910a8ac66992eb6eec86835a8444784ae69c19783d5de9a44edd8e6' 
  AND token = 'YW7EingP4Fu5oWhNVza09geipup6kyLC8cF0upMqzCk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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