Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c6c1c53284d6d2117dc37e61165d13ce9710c88aa4fb6694f6934aa0ce62c3c' 
  AND token = 'oSDg291Q8OD22vbbHmP30+3uvLpWGSNyg+3cqV2T7BE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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