Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b79825fa7c567e40936a61528152a6a8f2ed8c2a8d99a7b425dc014682852fe7' 
  AND token = 'sjYM/7bwv8IgrNRvYxz73sgn/sv9/IwTBXBMmSF6EbY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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