Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1bfa0a3c4ecb25962272f043e5c629855122e7576076749e8e4fdde406baa46' 
  AND token = 'b1oPOPLXF7R8ohgeCZyC783gP9m4nJRvVt7aYdV6+Eo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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