Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c38ad08e95dc6054b108c619248d3d5bc27be057b81b9a9095b997ce4d84a3c3' 
  AND token = 'N78DUK7c4ICOHVzlkBZfOXdp1f/FeQ0Rt7CFx7B4IdE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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