Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63c1e1b11b6b90f9043a1e2c6d51cb3351d96564f3b207c5e1a61d8a25a515c0' 
  AND token = 'JBftYrRzdWVk5KRA8wWHTDFgnte2R/owYoHNJo/x9gI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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