Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3971e4f97306961dcd7b56a89b06ee3533caca026a92d42b00b0a6cb61331d1' 
  AND token = '6TRD6t6alXCjCL1MfYhUFjfAmxTCHhnqtn+d16n1hCk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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