Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcb17a1b6245fd221cedfb37f97f435b2473f34484573a378a0c8a4164b8a3be' 
  AND token = 'QUNZ6f4C50tx3uwqrYZTHgzCqlf2+gPl0TRRD9IlQtE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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