Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ebc90c96572b363f7e9fec5a27902362b6f816e66b0a6d31ddc68fd3ea9d618' 
  AND token = 'C8PhBLbzWgni8zAIOnzSXIxA8AXLRtlqULnyjw2czKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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