Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4c1618d6a1cfb9261b7de54fe2e92c0a3657693c6eaaf924ee24fdd1131e8fd' 
  AND token = '/kVqm20va5NOadQILxp/Uh4+ucifBFzuRcln4hog+jA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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