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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '01a3ce05076012a8dcabe2f0ee0dfd2d79852bf7ba93a24f82b16ae36ce3629e' 
  AND token = 'Y6YShCwuILL98ADik8hM+m2M9E3lmEy/GkHo8mpD8/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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