Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0dfa18d0d2f782b9568f1f1bc221aa13a09950096df70be06e000572bb78c8ee' 
  AND token = 'hitFgH5ncJsfQPjnot2YtuMnZjqalp0FZlV9LatytLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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