Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a8faadd66b3dd278f1aef0769aa4d855826dee745262726e58fa11e811945a3' 
  AND token = 'MvE28BRwQHhSp11uCfxrMzg0Zr54dkbPUDgtYLK6c2A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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