Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc89184f27b47c68bd78ee3db737d33d02ce76a47c7121434caae0b29b4c40dd' 
  AND token = 'RbMcs4GpyG8Tne3Jtw5v33p0/zmG7jKV8b/vaEljAY0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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