Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f7b0aac14ba079d70f18be0bee7849c4afb6c97e29e239bcaf5b8e286a77246' 
  AND token = 'wT2XCQcTF2pt5McBj6z7PRE2JqzPl5wODF4NMvdaH3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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