Sandbox

SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '5b418c1f4f85633bc2f9551ac160dd4d144871d0d4908134cd3b1cdfcda5cc45' 
  AND token = '44ew/fBnfWOKn52WdKLbedWsTagY5gXFXz3PZJt/tR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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